"Krishna also relates that it was he, in a former incarnation, who communicated the indestructible yoga to an ancient illuminato, Vivasvat, who gave it to Manu, the great legislator. He, in turn, instructed Ikshwaku, the father of India's solar warrior dynasty. Passing thus from one to another, the royal yoga was guarded by the rishis until the coming of the materialistic ages. Then, due to priestly secrecy and man's indifference, the sacred knowledge gradually became inaccessible."